/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.sun.org.apache.xml.internal.security.utils;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.xml.namespace.NamespaceContext;

import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 */
public class DOMNamespaceContext implements NamespaceContext {

  private Map<String, String> namespaceMap = new HashMap<String, String>();

  public DOMNamespaceContext(Node contextNode) {
    addNamespaces(contextNode);
  }

  public String getNamespaceURI(String arg0) {
    return namespaceMap.get(arg0);
  }

  public String getPrefix(String arg0) {
    for (String key : namespaceMap.keySet()) {
      String value = namespaceMap.get(key);
      if (value.equals(arg0)) {
        return key;
      }
    }
    return null;
  }

  public Iterator<String> getPrefixes(String arg0) {
    return namespaceMap.keySet().iterator();
  }

  private void addNamespaces(Node element) {
    if (element.getParentNode() != null) {
      addNamespaces(element.getParentNode());
    }
    if (element instanceof Element) {
      Element el = (Element) element;
      NamedNodeMap map = el.getAttributes();
      for (int x = 0; x < map.getLength(); x++) {
        Attr attr = (Attr) map.item(x);
        if ("xmlns".equals(attr.getPrefix())) {
          namespaceMap.put(attr.getLocalName(), attr.getValue());
        }
      }
    }
  }
}
